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Email verifier

Check an address for format problems, look up its MX records over DNS over HTTPS, and flag disposable and free providers, all client side.

Type an address and press Verify address
The format check runs in this tab; the MX check asks the chosen DNS resolver over HTTPS.

What this tool does not do matters as much as what it does. A browser cannot open the raw SMTP connection a mailbox probe needs, so whether a specific mailbox exists is never claimed here; any service saying otherwise from a page like this is guessing. The disposable, free and role lists are small curated snapshots, not exhaustive registries, and a missing MX record does not always mean undeliverable: a minority of senders fall back to the domain's A or AAAA record. Format rules follow the common unquoted-atom profile; quoted local parts and IP-literal domains are flagged as unverified rather than guessed at.
OptionsVerify address

More web & auth tools

- Live DNS lookup (/network/dns)
- DNS explainer (/network/dns-explain)
- IP range classifier (/network/ip-classify)
All web & auth tools (/web)

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Markdown version: https://nutter.tools/web/email-verifier.md
Plain-text version: https://nutter.tools/web/email-verifier.txt
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